Design of an Axial Flux Inductor Type Synchronous Motor With the Liquid Nitrogen Cooled Field and Armature HTS Windings

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A liquid nitrogen cooled axial flux type high temperaturesuperconducting (HTS) synchronous motor was designed.This motor is an eight-pole inductor type synchronous motor withsix armature windings. The field windings and armature windingsare made of the BSCCO HTS wires.We called it Inductor type FluxControl Superconducting (IFCS) motor, and its output is 400 kWat the rated speed of 250 rpm. Until now, there were few armaturewindings using HTS wires, because of AC losses generation whenthe wires are used in the alternating magnetic field. In this motor,we used iron cores to decrease AC loss. Also because of the help ofiron cores, it is possible to make use of armature winding at liquidnitrogen temperature. Furthermore, inductors were employed inthe rotor. As a result, the cryostats that contain field HTS windingsand armature HTS windings can be fixed; also we do not need theexcitation devices such as the brushes and slip ring and the coolingdevices such as the rotary joint to offer the path for coolant to flow.